Miniature Ball Bearing Bearing Industry Number R144 Bore Diameter 1/8 in Closure Double Shielded For Environment Oily/Greasy Outer Ring Width 0.109 in Outside Diameter 1/4 in Ring Material Stainless Steel System of Measurement Inch Cage Material Stainless Steel ABEC Rating 1 Ball Material Alloy Steel Ball Material Grade AISI 52100 Bore Diameter Tolerance +0/-0.0003 in Cage Material Grade 304 Cage Type Shielded Dynamic Radial Load Capacity 64 lbf Flange Diameter Not Applicable